Deuteronomy 21:13-15

Living Bible

¹³ and change her clothing, laying aside that which she was wearing when she was captured, then remain in your home in mourning for her father and mother for a full month. After that you may marry her. ¹⁴ However, if after marrying her you decide you don’t like her, you must let her go free—you may not sell her or treat her as a slave, for you have humiliated her.

¹⁵ “If a man has two wives but loves one and not the other, and both have borne him children, and the mother of his oldest son is the wife he doesn’t love,